I have a 1996 skyline gtst and it’s hesitating at higher rpm so I decided to change my spark plugs to possibly fix it. The plugs I put in are NGK bcpr7es. After I started driving it seemed fine at first then it started to shake and there was a loss of power. Also when I was coming to a light on my way home it stalled when I was decelerating. Does anyone have any ideas what could be wrong?